Liebert UPS System user manual 12.5

Chapter 5 Operation of Display Panel

UL33-0400L 2001-11-08			12:30:20
Inv. On	Units:		ID 1
Mains		A(B)	B(C)	C(A)
Bypass	Power			221
Out	Cap Transfer with Interupt 12.5
Local	, Confirm			50.1
System				.41
Battery	Factor
Input Breaker Close		11£ -08 12:09
Byp. Breaker Close		11£ -08 12:09
Output Breaker Open11£ -08 12:09				OK
UPS in Normal Mode 11£ -08 12:09
Batt. Boost Charging 11£ -08 12:09

Fig. 5-40 Bypass to inverter prompt

From inverter to bypass mode with interruption:

If the bypass voltage or frequency exceeds the synchronized range and the UPS is in inverter mode, the system must let the user to confirm and accept the power interruption danger before pressing the inverter stop key to shutdown the output of the inverter. The user can also cancel the shutdown operation, as shown in Fig. 5-

41.If the bypass voltage restores to normal before the user makes the confirmation, the UPS will transfer to bypass operation mode automatically, and at the same time the prompt window will disappear soon.

UL33-0400L 2001-11-08		12:30:20
Inv. On	Units:	ID 1

Mains	A(B) B(C)	C(A)
Bypass	Power	221
Out	Cap This operation leads	12.5
	to output shutdown,	50.1
Local	Confirm or cancel
System		.41
Battery	Factor

Input Breaker Close 11£ 08- 12:09

Byp. Breaker Close 11£ -08 12:09

Output Breaker Open11£ 08- 12:09

UPS in Normal Mode 11£ 08- 12:09

Batt. Boost Charging 11£ 08- 12:09

C

OK

Fig. 5-41 Transfer to bypass prompt

Overload due to shutdown: The parallel operation system is in inverter mode, if the load capacity exceeds the total capacity of the remained UPS units when shut down one UPS unit. The UPS that is to be shut down will display a prompt window to ask the user to confirm before shutting down, as shown in Fig.5-42. If the load is reduced before the user makes confirmation, there will be no overload for the remained UPS units, this UPS unit will shut down automatically, and the Prompt window will disappear automatically, the functions of the keys in the Keypad display window will restore to normal functions.

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